EP 0066862 A1 19821215 - Demand defrost system.
Title (en)
Demand defrost system.
Title (de)
Bedarfsabtauungssystem.
Title (fr)
Système de dégivrage selon les besoins.
Publication
Application
Priority
US 27128881 A 19810608
Abstract (en)
A demand defrost system is provided for detecting the existence of frost build-up on the surface of the heat exchanger of a cooling system. A light beam is directed through the heat exchanger such that frost build-up blocks the path of the light from reaching a photocell. When the light received by the photocell falls below a selected value, a control signal is produced which discontinues cooling operation of the cooling system and initiates defrost heaters which heat the cooling coils and remove the frost build-up thereon. A temperature sensing switch is also provided which reinitiates the cooling cycle after a temperature indicates that frost has been removed from the cooling coils.
IPC 1-7
IPC 8 full level
F25D 21/02 (2006.01)
CPC (source: EP US)
F25D 21/02 (2013.01 - EP US); F25B 2700/111 (2013.01 - EP US)
Citation (search report)
- [X] DE 2456060 A1 19760610 - TEICHMANN & MEVS
- [Y] DE 2616498 A1 19771103 - SCHOENEICH
- [Y] US 4183223 A 19800115 - ALSENZ RICHARD H [US]
- [A] US 3280577 A 19661025 - TSUNEO KOBAYASHI, et al
- [A] DE 2602787 A1 19770804 - UNILEVER NV
- [A] GB 1069303 A 19670517 - PAOLA CHINAGLIA PERALE, et al
- [A] US 3961495 A 19760608 - BEAUVENT GUY, et al
- [A] DE 2453140 A1 19750515 - UPO OY
- [Y] US 3120108 A 19640204 - PANSING FRED L
- [A] US 4074987 A 19780221 - KRULEWICH EDWARD B
- [A] FR 1393431 A 19650326
- [A] US 4109481 A 19780829 - PEEK S CHRISTOPHER
- [A] DE 1501028 A1 19691023 - DIEHL FA
- [A] DE 2730648 A1 19790125 - STIEBEL ELTRON GMBH & CO KG
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 82104922 A 19820604; US 27128881 A 19810608